Typically this was done on ships. The bar stock was usually gold or silver.

They would heat up the bar, then pinch off a piece and give it a good smack with a stamp for the impression. That is why when you look at it, it is
not round. It is irregular edged.

That would also make it several hundred years old.

EDIT:

Incidentally, getting a positive ID could be near to impossible because the stamps changed as often as underwear. The symbols and subjects will be
your best bet for Identification if you are looking for a specific time frame.

As far as value, .. just as gold scrap you are looking at less than $2000. If you can get a Museum to ID it and put it on paper, .. well. ... ..
multiply that by the Nth Power.

You need to get this valued by a professional auction house like sotherbys but be carefull and insure it as if it is rare it may be very valuable,
KEEP it safe and best of luck.

Just of note there were some coin's produced in Eira and the Irish museum may be able to help, the subject's on the coin appear to have a Christian
theme especially the monarch or saint and the rear shows what may be haloed figure on the right but the left is too enigmatic.

Awesome find. That looks just like her but... Pope Leo pissed her off by not recognizing her reign and crowing another. Do you think placing the
Papal Staff in her hand might have been an act of angst against the pope then?

Mojave, I too thought Byzantine and I found this set on Ebay....
Byzantine Coins. I think the bottom right coin contains
similar text on the right side as the OP's coin. I do not know much more about OP's but the drawing of the King figure really screamed Byzantine to
me.

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